DS31256_V01 datasheet(178/183 Pages) MAXIM

Part #	DS31256

Description	256-Channel, High-Throughput HDLC Controller

PDF	183 Pages

Scroll/Zoom	100%

Manufacturer	MAXIM [Maxim Integrated Products]

Direct Link	https://www.maximintegrated.com/en.html

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DS31256 256-Channel, High-Throughput HDLC Controller

178 of 183

16.

THERMAL CHARACTERISTICS

Table 16-A. Thermal Properties, Natural Convection

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Ambient Temperature

(Note 1)

+70°C

°C

Junction Temperature

+125°C

°C

Theta-JA (

θJA), Still Air

(Note 2)

15.4

°C/W

Psi-JB (

ΨJB), Still Air

7.03

°C/W

Psi-JT (

ΨJT), Still Air

0.07

°C/W

Note 1: The package is mounted on a four-layer JEDEC standard test board with no airflow and dissipating maximum power.

Note 2: Theta-JA (

θJA) is the junction-to-ambient thermal resistance, when the package is mounted on a four-layer JEDEC standard test board

with no airflow and dissipating maximum power.

Table 16-B. Thermal Properties vs. Airflow

FORCED AIR (m/s)

THETA-JA (

θJA)

Psi-JB (

ΨJB)

Psi-JT (

ΨJT)

15.4

°C/W

7.03

°C/W

0.07

°C/W

13.0

°C/W

6.77

°C/W

0.40

°C/W

2.5

11.9

°C/W

6.53

°C/W

0.57

°C/W

Figure 16-1. 27mm x 27mm PBGA with 256 Balls, 2oz Planes, +70

°C

Ambient, Under Natural Convection at 3.0W

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